Thomas j



(Model.) l

T. J. HART.

. INJEGTOR..

No. 474,991.v Patented May 17,1892.

UNITED STATES PATENT OFFICE.

THOMAS J. HART, OF BUFFALO, NEI/V YORK, ASSIGNOR TO THE SHERWOOD MANUFACTURING COMPANY, OF SAME PLACE.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 474,991, dated May 17, 1892. Application iiled August 5, 1891. Serial No. 401,764. (Model.)

To all whom it may concern:

Be it known that I, THOMAS J. HART, a citizen of the United States, residing at the city r of Buialo,in the county of Erie and State of New York, have invented a new and useful Improvement in Injectors, of which the following is a specification.

This invention relates to that class of injectors commonly known as duplex injectro ors and which are provided with two sets of steam-nozzles and combining and delivery tubes, the steam-valves of which are controlled by a single hand-lever.

lThe objects of my invention are to utilize x5 the pressure of the duid for reliably closingv the primary overiiow-valve and to simplify the mechanism for operating the same.

a longitudinal sectional elevation of my imzo proved injector, showing the positionof the parts after the injector is started. Fig. 2 is a fragmentary longitudinal section of the injector, showing the primary overflow-valve closed and the secondary overflow-valve open. Fig. 3 is a similar View showing the primary steam-valve open and the secondary steamvalve closed. Fig. 4 is a top plan view of the injector. Fig. 5 is a fragmentary longitudinal section of the injector, on, an enlarged scale, showing the overflow-valves open. Fig.

6 is a cross-section in line mar, Fig. l.

Like letters of reference refer to like parts in the several figures.

A represents the shell or inclosing casing of the injector, which is preferably castin one piece in the ordinary manner.

b is the steam-inlet, connecting with a primary steam-chamber B, arranged in the upper front portion of the shell.

C is a secondary steam-chamber arranged below the primary steam-chamber B and separated from the latter by an angular diaphragm C.

d is the water-inlet, connected with a primary water-chamber D, arranged in the lower portion of the shell behind the secondary steam-chamber and separated from the latter by a diaphragm D.

, E is a screw-plug secured in a threaded opening formed in the vertical portion of the angular diaphragm C and having through its center a steam-passage e and at its front end a valve-seat e.

F is a primary conical steam-'valve arranged in front of the valve-seat e and controlling the admission of steam to the secondary steam-chamber C. This valve is secured to the inner portion of a Valve-stemf, which passes through a stuftlng-boxf, closing the open outer end of the primary steam-cham- 6o ber B. The valve-stem f is'secured to a slid- Y ing yoke or head G, which is guided upon a rod or stud g, projecting from the front end of the shell and is actuated by a hand-lever H. The latter is pivoted at its lower end to the yoke G and has its lower end pivotally connected with a projecting arm h of the shell j by a link h', so that upon shifting the hand- In the accompanying drawings, Figure l is lever in one or the other direction the primary steam-valve is opened or closed. y 7o I is a primary steam jet or nozzle secured in an opening formed in the front Wall D of the water-chamber and having the usual axial passage for the steam.

J is a combining-tube arranged in the wa- 475 ter-chamber D, axially in line with the steamjet I, and J is a delivery-tube arranged in rear of the combining-tube in a well-known manner and opening into a secondary water chamber or passage K, arranged in rear of 8o the secondarysteam-chamber and the primary water-chamber D and which receives water from the latter. These combining and delivery tubes and the steam-jet may be of any common construction. The secondary water and steam chambers are separated by a diaphragm lo. The primary steam-jetl with its combining and delivery tubes J J constitute the Water-lifting' devices of the injector.

L is a secondary steam jet or nozzle located 9o behind the primary steam-chamber B and having a central steam-passage Z arranged in line with the passage of the screw-plug E.

The steam-jet L projects into the upper portion of the secondary water-chamber and is provided in its rear portion with an enlarged cylindrical cavity or valve-seat l. M is a secondary cylindrical steam-,valve adapted to enter the cylindrical valve-seat Z and formed on or secured to the valve-stem f in advance Ico of the primary steam-valve F, so as to move simultaneously with the latter.

N is a secondary combining-tube arranged N constitute the forcing devices of the in-` jector.

P indicates an overflow-chamber arranged' i in the rear portion of the injector behind the secondary water-chamber K, and p is the exit through which the excess of water escapes from said chamber in starting the in jector.`

q is a rearward extension of the secondary water-chamber K, and q is an aperture or passage formed in the upper wall ofthe over- Iiow-ch-amber P and connecting the latter with the secondary waterfchaniber.

Aq2 is a valve-seat formed at the upper end of the passage Q', andr R is a primary overflow valve arranged within the chamber eX- tension q opposite the Valve-seat q2 and controlling the admission ot water into the overflow-chamber.A This valve is provided with a stein r, having wings r at its outer end, whereby it is guided in the tubular exi-t p of the overflow-chamber. The primary overflow.- valve and its seat are preferably conical, as shown. The valve is forced against its seat by the pressure of the fluid in the secondary water-chamber bearing against the fiat back of the valve.` A seating-spring S is preferably employed in` addition to the duid-pressure for pressing the valve against its seat Iwhen the injector is inverted or placed in any other position in which the valve would be liable to open by gravity. The primary overiiow-valve R is inserted and removed through openings s s formed, respectively, in the upper wall of the chamber extension q and the shell of` the injector, in line with each other, and closed by screw-plugs S2 s3, the extension N2 and thev secondary combinin g and delivery tubesN N being first removed to afford access to the inner screw-plug s3 andthe primary overflow-valve.

t are openings formed in the extension of the secondarycom bining-tube N near the rear end thereof.

u is an opening formed in the rear wall of the overflow-chamber P, and U is a passage leading from the openings of the secondary combining-tube to the opening in the rear wall of the overflow-chamber.

fu is a valve-seat,preferably conical, formed at the inner end of the opening u, and V is a secondary overflow-valve of corresponding form, adapted to close against said seat for shutting off the flow of water from` the passage U to the overflow-chamber P. This valve is attached to a stem fu', which passes through a stuffing-box W, secured in an opening in the rear end of the injector or shell. The secondary valve is connected with the hand-lever by links or connecting-rods x, attached at their rear ends to a cross-head X, secured to the projecting portion of the valve-stein o and at their opposite ends to the cross pin or head X', whereby the hand-lever is pivoted to the yoke. By this connection the secondary overliow-valve is moved toward its seat at the` same time that both steam-valves are moved away from their seats, and vice versa.

'y is a cam or tinger connected with the secondary overiiow-valve V for opening the pri- 'mary overflow-valve and holding the same 1n The stem ot' the primary overflow-valve is bifurcated and provided with an anti-friction roller y', agains-twhich the incline of the cam y bears in opening the valve. The carrying-arm of the cam passes between the jaws of the b-it'urcated valve-stem.,

anopen position.

and the cam stands in front of the anti-friction roller and clears the latter when the secondary overflow-valve is closed.- Upon shifting the hand-leyer inwardly in the direction of-the arrow the secondary overiow-valve recedes from itsfseat and carries the cam y with it. The rearward movement of the cam causes theanti-friction roller of the primary overflowvalve to ride up the incline of the cam, the rearward movement of the cani being arrested when its nose reaches the under side of the roller, so as to support and hold the primary overflow-valve in an' open position. Upon shifting they hand-lever in the opposite direction the cam is caused to move forwardly, allowing the anti-friction roller to ride down the incline of the cam and permitting the valve to be closed against its seat by its spring and the pressure of the iiuid in the secondary water-chamber. The movements of the primary and secondary overflow-valves are so timed relatively to the steam-Valves that in shifting the hand-lever to start the injector the primary overiow-valve is closed a short interval in advance of the secondary steamvalve and the secondary overow-valve is closed ashort interval after the secondary steam -valve is opened. Before admitting steam to the injector thehand-lever is moved inwardly to the limit of its movement. This movement closes both steam-valves F and M, opens the secondary overflow-valve V, and causes the cam of the latter to open the primary overiiow-valve R, as represented in Figs. 2 and 5.

In starting the injector the hand-lever is shifted to the outward extremity of its stroke. The first part of this outward movement opens the primary steam-valve F, but leaves the secondary steam-valve M closed, asrepresented in- Fig. 3, thus admitting steam to the secondary steam-chamber and the primary steamjet i1 and causing the latter to lift the water into the primary water-chamber D and force it through the primary combining and deliv ery `tubes J J into the secondary water or connecting chamber K and fromthe latter TOO IIO

IZO

through the passage q into the overflow-chamber P, from which it is finally discharged through the exit p. As soon as the water overiiows by passing the primary overflow-valve the latter is released from the cam and closed by the water-pressurein the secondary waterchamber, as represented in Fig. 2, thereby preventing the further escape of the water from said chamber. The continued outward movement of the hand -lever next opens the secondary steam-valve, as represented in Fig. 1, and admits a portion of the :incoming steam to the secondary steam-jet L, thereby raising the water in the secondary water-chamber, forcing it through the secondary combining and delivery tubes N N', and causing it to overtlow through the aperture t, passages U and u, overflow-chamber P, and exit p. Immediately after the second overflow of Water occurs the secondary overflow-valve is closed by the final portion of the outward movement of the hand lever, as shown in Fig. 1, thus cutting off the further escape of the water through the overflow,- chamber P and causing the water to be directed through the outlet O and into the boiler. The cam carried by the secondary overiiow valve has suiticient dead or lost movement to hold the primary valve open the required length of time before releasing it. By so arranging the primary overflow-valve that it is kept closed by the fluid-pressure in the secondary water-chamber the latter chamber is instantly and reliably cut off fromthe ovcriioW-chamber as soon as the first spurt or overiiow of water takes place in starting the injector, thereby reducing to a minimum the interval during which the overflow-passage is open and obviating unnecessary leakage of water. The seating-spring S, inaddition to its function of closing the primary overflowvalve R in all positions of the injector, also serves to hasten the closing action of said valve. y

The mechanism for holding the primary valve in an open position and suddenly releasing and closing it is very simple and not liable to get out of order.

I claim as my invention- 1. In an injector, the combination, with a steam-inlet and water lifting and forcing devices, of a-water-inlet and a water-chamber, an overiiow passage or chamber connected with the water-chamber,y an overflow-valve applied to said overflow-passage and closed by the iiuid-pressure in the'water-chamber, and a cam or lifting-linger whereby the overflow-valve is opened, substantially as set forth.

2. In an injector, the combination, with a steam-inlet, a steam-jet, and a water-delivery device, of a steam-valve controlling the supply of steam to the steam-jet, ahand-lever for operating said valve, a water-inlet and a water-chamber, an overflow passage or chamber connected with the water-chamber, a valve applied to said overflow-passage and closed by the duid-pressure in the water-chamber,

and a cam holding the valve in an open position and operated from the hand-lever of the steam-valve, substantially as set forth.

3. In an injector, the combination, with the primary and secondary steam-chambers and a passage connecting the same, of a Waterinlet and a primary Water-chamber having a primary steam-jet and a delivery device, a secondary Water-chamber having a secondary steam-jet and a delivery device, connected primary and secondary steam-valves applied, respectively, to the secondary steam-Jet and the connecting-passage of the steam-chambers, a hand-lever for operating said valves, an overflow-chamber having passages Whereby it communicates with the secondary waterchamber and the delivery device of said chamber, a primary overflow-valve applied t0 one of said passages and closed by the duid-pressure in the secondary water-chamber, a secondary overflowvalve applied to the other passage and operated from the hand-lever of the steam-valves, and a cam or finger connected with said secondary overflow-valve and closing the primary overiiow-valve, substantially as set forth.

lVitness my hand this 1st day of August, 1891. Y

THOS. J. HART.

Witnesses:

THEO. L. Porr, CARL F. GEYER. 

